Acarinina esnaensis


Classification: pf_cenozoic -> muricate non-spinose -> Truncorotaloididae -> Acarinina -> Acarinina esnaensis
Sister taxa: A. africana, A. alticonica, A. angulosa, A. aspensis, A. boudreauxi, A. bullbrooki, A. coalingensis, A. collactea, A. cuneicamerata, A. echinata, A. esnaensis, A. esnehensis, A. interposita, A. mcgowrani, A. mckannai, A. medizzai, A. nitida, A. pentacamerata, A. praetopilensis, A. primitiva, A. pseudosubsphaerica, A. pseudotopilensis, A. punctocarinata, A. quetra, A. rohri, > >>

Taxonomy

Citation: Acarinina esnaensis (LeRoy 1953)
Rank: Species
Basionym: Globigerina esnaensis
Synonyms:
Taxonomic discussion: This taxon has had a colorful history. Originally described from the upper Paleocene (Zone P4/5) of Egypt by LeRoy (1953), it was virtually simultaneously described from the upper Paleocene of the North Caucasus by Subbotina (1953) under the name Acarinina intermedia, with LeRoy’s taxon having (subjective synonym) seniority by 10 months. Since that time it has been recorded under a variety of names, as was already recognized over 40 years ago by McGowran (1965; see synonymy above). The synonymy of Acarinina esnaensis and A. intermedia was verified by one of us (WAB) in the course of examination of type material of intermedia in the collections of N .N. Subbotina at VNIGRI (in 1962 and 1977) in Leningrad/ St. Petersburg and subsequent comparison of topotype material provided by Subbotina with the holotype of A. esnaensis in the Cushman collections of the USNM.
Acarinina esnaensis is generally characterized by a relatively flat spiral side and varies from having globular to subangular chambers in peripheral edge view (compare the illustrations in McGowran [1965] with illustrations of esnaensis and irrorata and tribulosa in Loeblich and Tappan [1957]). Forms with an odd/ anomalous apertural modification (a vertically disposed, narrow, slit-like aperture) are included here in this taxon; compare Loeblich and Tappan (1957, pl. 61: figs. 9a-c) with Berggren (1960a, pl. 5. figs. 3a-d) from Zone P7 of the Røsnaes Clay Fm., Røgle Klint, Denmark.
The holotype specimens of esnaensis and wilcoxensis are markedly similar. However, examination of large suites of individuals reveals that there are two separate and distinct taxa involved. Acarinina esnaensis is generally more elongate-oval in outline, and has a narrower umbilicus than A. wilcoxensis.
Blow (1979, p. 906) considered Acarinina intermedia to have evolved from A. acarinata (= nitida) and to have been ancestral to A. wilcoxensis and also to the A. pseudotopilensis -topilensis s.l. lineage. The transition to A. pseudotopilensis was said to involve a tangential lengthening of the later chambers at the expense of their radial width concomitant with these same chambers becoming disjunct and slightly laterally angulate. Blow (1979, p. 906) pointed to (paratypic) individuals referred to, and illustrated as, A. intermedia by Subbotina (1953, pl. 21, figs. 9a-c and pl. 22, figs. 2a-c) as representing intermediate forms between the two taxa. These views are supported by our own observations on comparative material. [Berggren et al. 2006]

Catalog entries: Globigerina esnaensis;

Type images:

Short diagnosis: This taxon is distinguished by its generally elongate-oval shape, with 4 rounded to subangulate, closely appressed, embracing chambers in the final whorl, narrow umbilicus, with the later chambers on the spiral side tangentially longer than radially broad.

NB The short diagnoses are used in the tables of daughter-taxa to act as quick summaries of the differences between e.g. species of one genus. They have initially been copied from the diagnostic characters/distinguishing features sections of the Eocene and Paleocene Atlases, they will be edited as the site is developed.

Description


Diagnostic characters: This taxon is distinguished by its generally elongate-oval shape, with 4 rounded to subangulate, closely appressed, embracing chambers in the final whorl, narrow umbilicus, with the later chambers on the spiral side tangentially longer than radially broad. [Berggren et al. 2006]

Wall type: Muricate, non-spinose, normal perforate. [Berggren et al. 2006]

Test morphology: Low-trochospiral, subquadrate test with somewhat lobulate peripheral outline; periphery rounded to subacute; 4-4½ subovate to subspherical chambers in final whorl, moderately inflated; intercameral sutures radial to slightly curved on umbilical side; umbilicus small, open; 12-15 chambers on spiral side, gradually increasing in size as added; sutures distinct, depressed, straight to slightly curved in direction of coiling; wall densely muricate, particularly along periphery; aperture a long, low interiomarginal, umbilical-extraumbilical arch extending nearly to the periphery with very thin lip. [Berggren et al. 2006]

Size: Maximum diameter of holotype 0.44 mm; thickness 0.26 mm. [Berggren et al. 2006]

Character matrix

test outline:Subquadratecoiling axis:Lowchamber arrangement:Trochospiralumbilicus:Narrow
edge view:Equally biconvexumbilical or test sutures:Moderately depressedspiral sutures:Moderately depressedshell porosity:Finely Perforate: 1-2.5
wall texture:Coarsely muricateaperture:Umb.-extraumbilicalaperture border:Thin lipaccessory apertures:None
periphery:N/Aumb chamber shape:Inflatedsp chbr shape:Inflatedperiph margin shape:Broadly rounded
umb depth:Deepdiameter mm:0.44width mm:breadth mm:0.26
final-whorl chambers:4.0-4.5

Biogeography and Palaeobiology


Geographic distribution: Widespread in low latitudes, (sub)tropical latitudes as well as in high northern (Scandinavia) and southern/austral latitudes (e.g., Kerguelen Plateau, Maud Rise). [Berggren et al. 2006]
Aze et al. 2011 summary: Low to high latitudes; based on Berggren et al. (2006b)

Isotope paleobiology: No data available [Berggren et al. 2006]
Aze et al. 2011 ecogroup 1 - Open ocean mixed-layer tropical/subtropical, with symbionts. Based on very heavy δ13C and relatively light δ18O. Sources cited by Aze et al. 2011 (appendix S3): this study

Phylogenetic relations: This taxon is ancestral to Acarinina wilcoxensis and may have evolved from Acarinina nitida in the upper Paleocene (although it was not included in Olsson and others, 1999). [Berggren et al. 2006]

Biostratigraphic distribution

Geological Range:
Notes: Zone P4 (upper part) to Zone E5. While this taxon has its lowest occurrence in upper Zone P4, we have found that it is particularly common and well developed within Zones P5-E2 and, in particular, within the interval of the Carbon Isotope Excursion (CIE) in the Bass River core drilled on the New Jersey Coastal Plain (basal Zone E1), where it occurs with early specimens of Acarinina wilcoxensis. The latter has its FAD just below the base of the CIE in Egypt. [Berggren et al. 2006]
Last occurrence (top): within E6 zone (50.20-50.67Ma, top in Ypresian stage). Data source: Eocene Atlas
First occurrence (base): within P5 zone (55.96-57.10Ma, base in Thanetian stage). Data source: Eocene Atlas

Plot of occurrence data:

Primary source for this page: Berggren et al. 2006 - Atlas of Eocene Planktonic Foraminifera, chapter 9, p. 286

References:

Berggren, W.A., (1960). Some planktonic foraminifera from the lower Eocene (Ypresian) of Denmark and northwestern Germany. Stockholm Contributions in Geology, 5(3): 41-108.

Berggren, W.A., (1977). Atlas of Palaeogene Planktonic Foraminifera: some Species of the Genera Subbotina, Planorotalites, Morozovella, Acarinina and Truncorotaloides. In: Ramsay, A.T.S. (Editor), Oceanic Micropaleontology. Academic Press, London, pp. 205-300.

Berggren, W.A.; Pearson, P.N.; Huber, B.T. & Wade, B.S., (2006). Taxonomy, biostratigraphy, and phylogeny of Eocene Acarinina. In: Pearson, P.N. et al. (Editors), Atlas of Eocene Planktonic Foraminifera, Cushman Foundation Special Publication 41. Allen Press, Lawrence, Kansas, pp. 257-326.

Blow, W.H., (1979). The Cainozoic Globigerinida: A study of the morphology, taxonomy, evolutionary relationships and stratigraphical distribution of some Globigerinida (mainly Globigerinacea). E. J. Brill, Leiden, 1413 pp.

Cushman, J.A. & Ponton, G.M., (1932). An Eocene foraminiferal fauna of Wilcox age from Alabama. Contributions from the Cushman Laboratory for Foraminiferal. Research, 8: 51-72.

El-Naggar, Z.R., (1966). Stratigraphy and planktonic foraminifera of the Upper Cretaceous-Lower Tertiary succession in the Esna-Idfu region, Nile Valley, Egypt, U. A. R. Bulletin of the British Museum (Natural History) Geology, supplement 2: 1-291.

Gartner, S. & Hay, W.W., (1962). Planktonic foraminifera from the type Ilerdian. . Eclogae Geologicae Helvetiae, 55(2): 561.

Gohrbandt, K., (1963). Zur Gliederung des Palaeogen im Helvetikum nordlich Salzburg nach planktonischen Foraminiferen. . Mitt Geol Ges, Wien, 56(1): 63.

Huber, B.T., (1991). Paleogene and early Neogene planktonic foraminifer biostratigraphy of ODP Leg 119 Sites 738 and 744, Kerguelen Plateau (southern Indian Ocean). Proceedings of the Ocean Drilling Program, Scientific Results, 119: 427-449.

Jenkins, D.G., (1971). New Zealand Cenozoic Planktonic Foraminifera. New Zealand Geological Survey, Paleontological Bulletin, 42: 1-278.

Leroy, L.W., (1953). Biostratigraphy of the Maqfi Section, Egypt. . Memoir of the Geological Society of America, 54: 1-73.

Loeblich, A.R., Jr. & Tappan, H., (1957). Planktonic foraminifera of Paleocene and early Eocene Age from the Gulf and Atlantic coastal plains. In: Loeblich, A.R., Jr. et al. (Editors), Studies in Foraminifera, U.S. National Museum Bulletin 215. U.S. Government Printing Office, Washington, D.C., pp. 173-198.

McGowran, B.J., (1965). Two Paleocene foraminiferal faunas from the Wangerrip Group, Pebble Point Coastal Section, Western Australia. Proceedings of the Royal Society of Victoria, 79: 9-74.

McGowran, B., (1968). Reclassification of Early Tertiary Globorotalia. Micropaleontology, 14: 179-198.

Nakkady, E., (1959). Biostratigraphy of the Um Elghanayem section, Egypt. Micropaleontology, 5: 453-472.

Olsson, R.K.; Hemleben, C.; Berggren, W.A. & Huber, B.T., (1999). Atlas of Paleocene Planktonic Foraminifera. Smithsonian Contributions to Paleobiology. Smithsonian Institution Press, Washington, DC, 1-252 pp.

Said, R. & Kenaway, A., (1956). Upper Cretaceous and lower Tertiary foraminifera from northern Sinai, Egypt. Micropaleontology, 2: 105-173.

Said, R. & Kerdany, M.T., (1961). The geology and micropaleontology of the Farafra Oasis, Egypt. Micropaleontology, 7: 317-336.

Said, R. & Sabry, H., (1964). Planktonic foraminifera from the type locality of the Esna Shale in Egypt. Micropaleontology, 10: 375-395.

Stott, L.D. & Kennett, J.P., (1990). The Paleoceanographic and Paleoclimatic signature of the Cretaceous/Paleogene boundary in the Antarctic: Stable isotopic results from ODP Leg 113. Proceedings of the Ocean Drilling Program, Scientific Results, 113: 829-848.

Stott, L.D. & Kennett, J.P., (1991). Antarctic Paleogene Planktonic Foraminifer Biostratigraphy: ODP Leg 113, Sites 689 and 690. Proceedings of the Ocean Drilling Program, Scientific Results, 113: 549- 569.


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Acarinina esnaensis compiled by the pforams@mikrotax project team viewed: 23-7-2017

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